Study free. Pay only for premium AI.
Public study material, practice tests and the free AI tutor cost nothing — no subscription, no card. Premium models, voice and AI generation are optional, paid from a prepaid wallet by what you use.
| Feature | Cost |
|---|---|
Public study & practice tests Browse public courses and study notes, and take existing practice tests | Freeno card needed |
Free AI tutor The default tutor and other models marked free. Daily and per-minute fair-use limits apply | Freefair-use limits |
Premium AI models Gemini and other premium tutor models, charged by the tokens a conversation uses at that model's rate | By usagetokens used |
Voice conversation Charged at the start of each 60-second period, including the first | $0.20per 60 seconds |
AI generation Practice questions, flashcards, study documents and curricula, priced per request by its size (such as the number of questions or source documents) and the model used | By requestsize and model |
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How pricing works
Free means free
Studying public material, taking practice tests and chatting with the free tutor never touch your wallet. You don't need a card to start.
Fair-use limits
The free tutor has daily and per-minute limits so it stays free for everyone. Premium models are there if you want more.
Pay for what you use
Premium AI is charged from your wallet by actual usage: tokens for premium chat, 60-second periods for voice, request size for generation. No monthly plan, nothing renews.
Start small
Top-ups start at $5. New accounts with a verified email get a one-time $2 welcome credit, once per email address.